• Title/Summary/Keyword: Modelling behavior

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A Study on the Pullout Behavior of Ground Anchored in Weatherd Rock (풍화암에 근입된 그라운드 앵커의 인발거동 연구)

  • Park, Byung-Soo;Jeong, Gil-Soo;Jeon, Sang-Hyun;Yoo, Nam-Jae
    • Journal of Industrial Technology
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    • v.26 no.A
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    • pp.109-117
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    • 2006
  • This study is an numerical study of predicting the behavior of anchor embedded in weathered rocks, subjected to uplift loads, about ultimate pullout capacity and the failure mechanism. Factors influencing the behavior of anchors were investigated by reviewing the data about in-situ anchor tests performing numerical modelling with changing the bondage length of anchor, diameter of anchor body and diameter of tenden, and by Correlations between those factors were evaluated to apply them to predict the behavior of anchors. As results of numerical analysis, a linear relationship between bondage length, diameter of anchor body and diameter of tenden with ultimate pullout capacity was obtained on the one hand, from the result of numerical analysis changing the Young's modulus of weathered rock, this parameter was found to inflence to load-displacement and ultimate pullout capacity within the range of 10%, which was mot so significant to affect.

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Development and testing of the hydrogen behavior tool for Falcon - HYPE

  • Piotr Konarski;Cedric Cozzo;Grigori Khvostov;Hakim Ferroukhi
    • Nuclear Engineering and Technology
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    • v.56 no.2
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    • pp.728-744
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    • 2024
  • The presence of hydrogen absorbed by zirconium-based cladding materials during reactor operation can trigger degradation mechanisms and endanger the rod integrity. Ensuring the durability of the rods in extended time-frames like dry storage requires anticipating hydrogen behavior using numerical modeling. In this context, the present paper describes a hydrogen post-processing tool for Falcon - HYPE, a PSI's in-house tool able to calculate hydrogen uptake, transport, thermochemistry, reorientation of hydrides and hydrogen-related failure criteria. The tool extracts all necessary data from a Falcon output file; therefore, it can be considered loosely coupled to Falcon. HYPE has been successfully validated against experimental data and applied to reactor operation and interim storage scenarios to present its capabilities.

Structural Behavior of Underground Subway Structures According to Structural Model (구조 모델링 방법에 따른 지하철 정거장 구조물의 거동)

  • Park Eik-Tae;Lee Hwan-Woo;Kim Kwang-Yang
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2005.04a
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    • pp.3-11
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    • 2005
  • The structural analysis considering the soil-structure interaction is very important in the design process of underground structures located on the site with various soil conditions. In practice, simplified modelling techniques to obtain the approximate solution are used in accordance with the specifications. However, their details are insufficient for practical engineers to obtain the stable solutions and the analysis results of each engineer occasionally my be different in spite of the same problem. In this study, the sensitivity of structural behaviour on the underground structures is analyzed according to the structural modelling techniques of existing specifications. It is performed to obtain the fundamental informations to establish the guide to obtain the stable solutions in practical analysis of the underground structures such as subway structures.

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Development of the CAD Modelling System for the Submarine Digital Mockup (자수함 디지털 목업 형상화 시스템 개발)

  • 김성용
    • Journal of the Korea Institute of Military Science and Technology
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    • v.4 no.1
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    • pp.62-72
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    • 2001
  • In the countries of USA, UK, etc, which have the advanced submarine design technologies, the digital mockup actively applies in the naval ship and the submarine design, because it has many advantages such as the reduction of shipbuilding periods and costs, the potential of easier design changes, the combination of visualization with realistic behavior and so on. This paper includes the architecture development methods of digital mockup system and presents the S/W and H/W architecture scheme and the methods of 3D CAD modelling system of a submarine hull and machineries for the conceptual design verification.

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A Study on the Exhaust System Model for Thermal Stress Analysis of Exhaust Manifold (배기매니폴드의 열응력 해석을 위한 배기계 모델 구성에 관한 연구)

  • Choi, Bok-Lok;Lee, Kyung-Woo;Chang, Hoon
    • Transactions of the Korean Society of Automotive Engineers
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    • v.18 no.6
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    • pp.7-13
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    • 2010
  • In this study, we investigated the efficient FE modelling techniques for thermal stress analysis of the exhaust manifold subject to thermo-mechanical cyclic loadings. At first, full engine model was considered to identify the critical locations and their results were compared to failure site shown by the engine bench test. And the equivalent system model was proposed based on the mechanical behavior of the full engine model. The weak areas of both FE models show a good agreement with the experimental crack location. As a result, a simplified modelling methodology was verified to estimate the thermo-mechanical behaviors of the exhaust manifold under thermal shock test condition.

The Bend Modelling Technique in the Vibration Analysis of the Exhaust System (배기계 진동해석에서의 굴곡부 모델링기법)

  • 김윤영;이장명;김진홍
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.19 no.2
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    • pp.597-604
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    • 1995
  • When a pipe bend is modelled with straight beam elements, its stiffness, particularly in bending behavior, is overestimated than its true value. In this paper, we propose a simple and practical beam-modelling technique to estimate its stiffness properly. When this technique, based on the strain energy concept, is employed to modify the beam sectional properties of the bend, quite satisfactory results can be obtained. To verify the validity of this method, we apply the present technique to the free vibration analysis of a center pipe with 2 bends, one of the three components of the automobile exhaust system.

On Evaluation of Stacking Fault in CERP Composite Plates of Using Ultrasonic Images (초음파 이미지를 이용한 CFRP 복합적층판의 적층결함 평가)

  • 임광희;나승우;심재기;양인영
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2003.04a
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    • pp.121-124
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    • 2003
  • This paper shows shear wave behavior of CFRP(carton fiber reinforced plastics) composite laminates as a polar grid form to evaluate vibration pattern of ultrasonic transducers, which gives measured modelling fundamental contents of nondestructive evaluation. This modelling decomposes the transmission of a linearly polarized wave into orthogonal components through each ply of a laminate. It is found that a high probability shows between the model and measurement system in characterizing lay up of CFRP composite laminates. Also evaluating quantitatively the defects in CFRP laminates who found to be possible of normalized frequency obtained from 2D-FFT technique based on C-scan method. Thus, the technique is proven to be one of the useful means to evaluate any internal defect in CFRP composite laminates.

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A Study on the Demand Modelling for District Cooling Energy Source (지역냉방 열원의 수요모형에 관한 연구)

  • Kim, Jin Hyung;Choi, Byung Ryeal
    • Environmental and Resource Economics Review
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    • v.11 no.4
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    • pp.633-657
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    • 2002
  • This study presents a demand modelling for landfill gas, which is used as alternative energy source for district cooling business. By analyzing the cost minimizing behavior of producer facing with three alternative energy sources such as electricity, cooling heat water, and gas, a demand function for landfill gas is derived from the optimal operating time of gas fired production facility, and estimated using unpublished data, which are associated with Seoul city's development plan for Sang-am area. The estimation results repeals that Seoul City could supply the land-fill gas of 13.76 million cubic meters each year at the price of about 16 won per cubic meters. However, if the investment costs associated with installation of gas collecting facilities are treated as sunk costs, annual amount of gas supplied is expected to increase to 14.22 million cubic meters at a lower unit price of 14.76 won.

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Safety Assessment of Cracked Prestressed concrete Cylinder Pipes (균열손상을 입은 프리스트레스트 콘크리트관의 안전도분석)

  • Kim, Young Jin;Lee, Sang Min;Lee, Ki Seong
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.2 no.3
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    • pp.168-175
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    • 1998
  • This study investigated the structural performance of the precast prestressed cylinder pipe having cracked under construction. The finite element formulation of PPC pipe incorporates Asoild elements using SAP90 program and the radial prestress force was transformed into the eqivalent external pressure. The analytical results were compared with the experimental results of full scale tests on PPC pipes subjected to static load. It is shown that the proposed modelling gives a realistic represention of the actual behavior. The analytical procedure is used to calculate the stresses in the PPC pipes and to check the crack opening under various situations such as bedding angle, earth pressure, and earth cover. Finally, the proposed modelling and analytical procedure should be especially usefull for the safety assessment of the PPC pipes under general loading conditions.

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A Study on High Temperature Low Cycle Fatigue Crack Growth Modelling by Neural Networks (신경회로망을 이용한 고온 저사이클 피로균열성장 모델링에 관한 연구)

  • Ju, Won-Sik;Jo, Seok-Su
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.20 no.4
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    • pp.2752-2759
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    • 1996
  • This paper presents crack growth analysis approach on the basis of neural networks, a branch of cognitive science to high temperature low cycle fatigue that shows strong nonlinearity in material behavior. As the number of data patterns on crack growth increase, pattern classification occurs well and two point representation scheme with gradient of crack growth curve simulates crack growth rate better than one point representation scheme. Optimal number of learning data exists and excessive number of learning data increases estimated mean error with remarkable learning time J-da/dt relation predicted by neural networks shows that test condition with unlearned data is simulated well within estimated mean error(5%).